Medical stopcock

Abstract

A medical stopcock includes a main body; and a cock. The main body includes: a tubular portion; an upstream port and a downstream port; and a bypass port provided between the upstream port and the downstream port. The cock includes: a cylindrical portion rotatably accommodated in the tubular portion of the main body; and a handle configured to allow rotation of the cylindrical portion. The cylindrical portion includes: a first flow path groove communicating with the upstream port and the bypass port when the cock is in a reference position, a second flow path groove communicating with the bypass port and the downstream port when the cock is in a reference position, at least one wall portion closing openings of the upstream port, the bypass port and the downstream port when the cock is rotated by a predetermined amount from the reference position.

What is claimed is: 
     
       1. A medical stopcock comprising:
 a main body; and 
 a cock, 
 wherein the main body includes:
 a tubular portion; 
 an upstream port and a downstream port provided on an outer circumference of the tubular portion; and 
 a bypass port provided between the upstream port and the downstream port, wherein the cock includes: 
 a cylindrical portion rotatably accommodated in the tubular portion of the main body; and 
 a handle configured to allow rotation of the cylindrical portion, 
 wherein the cylindrical portion includes:
 a first flow path groove on an outer circumferential surface of the cylindrical portion, the first flow path groove communicating with the upstream port and the bypass port when the cock is in a reference position, 
 a second flow path groove on an outer circumferential surface of the cylindrical portion, the second flow path groove communicating with the bypass port and the downstream port when the cock is in the reference position, and 
 a plurality of wall portions configured to simultaneously close openings of the upstream port, the bypass port and the downstream port when the cock is rotated by a predetermined amount from the reference position, 
 wherein the first flow path groove and the second flow path groove are configured to bypass respective ones of the plurality of wall portions, 
 
 
 wherein the upstream port, the bypass port and the downstream port communicate with each other when the cock is in the reference position, 
 wherein the first flow path groove includes:
 a groove corresponding to the upstream port and communicating with the upstream port; 
 a first groove corresponding to the bypass port and communicating with the bypass port; and 
 a first circumferential groove communicating with the groove corresponding to the upstream port and the first groove corresponding to the bypass port, and 
 
 wherein the second flow path groove includes:
 a groove corresponding to the downstream port and communicating with the downstream port; 
 a second groove corresponding to the bypass port and communicating with the bypass port; and 
 a second circumferential groove communicating with the second groove corresponding to the bypass port and the groove corresponding to the downstream port. 
 
 
     
     
       2. The medical stopcock according to  claim 1 , wherein a first rib is provided between the first groove corresponding to the bypass port and the second groove corresponding to the bypass port, the first rib being configured to lead a medical fluid from the upstream port into the bypass port side of the main body. 
     
     
       3. The medical stopcock according to  claim 2 , wherein a second rib is provided inside the bypass port of the main body in proximity to the first rib when the cock is in the reference position, the second rib being configured to further lead the medical fluid from the upstream port into the bypass port side. 
     
     
       4. The medical stopcock according to  claim 1 , wherein
 the plurality of wall portions includes:
 a first wall portion positioned between the groove corresponding to the upstream port and the first groove corresponding to the bypass port; 
 a second wall portion positioned between the second groove corresponding to the bypass port and the groove corresponding to the downstream port; and 
 a third wall portion positioned between the groove corresponding to the downstream port and the groove corresponding to the upstream port. 
 
 
     
     
       5. The medical stopcock according to  claim 4 , wherein:
 the first circumferential groove has a first path and a second path, wherein the first path of the first circumferential groove bypasses the first wall portion at a first end side of the cylindrical portion, and the second path of the first circumferential groove bypasses the first wall portion at a second end side of the cylindrical portion, and 
 the second circumferential groove has a first path and a second path, wherein the first path of the second circumferential groove bypasses the second wall portion at a first end side of the cylindrical portion, and the second path of the second circumferential groove bypasses the second wall portion at a second end side of the cylindrical portion. 
 
     
     
       6. The medical stopcock according to  claim 4 , wherein:
 the first circumferential groove bypasses the first wall portion at a first end side of the cylindrical portion, and 
 the second circumferential groove bypasses the second wall portion at an opposing second end side of the cylindrical portion.